數(shù)詞定義:表示數(shù)目多少或順序次第的詞叫作數(shù)詞。數(shù)詞包括基數(shù)詞和序數(shù)詞兩種基數(shù)詞1至12的基數(shù)詞是獨(dú)立的詞：onetwothreefourfivesixseveneightnineteneleventwelve13至19的基數(shù)詞以后綴-teen結(jié)尾：thirteenfourteenfifteensixteenseventeeneighteennineteen20至90的整十位數(shù)的詞以后綴-ty結(jié)尾：twentythirtyfortyfiftysixtyseventyeightyninety幾十幾的基數(shù)詞由十位數(shù)的詞和個(gè)位數(shù)的詞合成，中間加連字符“-”eg:34thirty-four42forty-two三位數(shù)的基數(shù)詞須在百位和十位（若無(wú)十位則和個(gè)位）之間加andeg:158onehundredandfifty-eight四位數(shù)即1，000以上的基數(shù)詞，從后往前數(shù)，每三位加一個(gè)逗號(hào)“，”第一個(gè)逗號(hào)前為千thousand,第二個(gè)逗號(hào)前為百萬(wàn)million,第三個(gè)逗號(hào)前為十億billioneg:6,364,285,751sixbillion,threehundredandsixty-fourmillion,twohundredandeighty-fivethousand,sevenhundredandfiftyone序數(shù)詞第1到第3:firstsecondthird第4到第19的序數(shù)詞以后綴-th結(jié)尾：fourthfifthsixthseventheighthninthtentheleventhtwelfththirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenth第20到第90的十位數(shù)序數(shù)詞變-y為-i再加eth:twentieththirtiethfortiethfiftiethsixtiethseventietheightiethninetieth整單位數(shù)的序數(shù)詞直接加th:hundredththousandthmillionthbillionth其余的序數(shù)詞的構(gòu)成為：基數(shù)詞+序數(shù)詞eg:132ndonehundredandthirty-second小數(shù)表達(dá)法eg:3.26threepointtwosix分?jǐn)?shù)表達(dá)法eg:1/5onefifth2/5twofifths1/5oneinfive或oneoutoffive百分?jǐn)?shù)表達(dá)法eg:45%forty-fivepercent倍數(shù)表達(dá)法A、Ais+倍數(shù)as+adj./adv.原級(jí)(many/much+n.)+as+Beg:LineAisthreetimesaslongaslineB.(AustraliahasfourteentimesasmanypeopleasAmerica.)B、Ais+倍數(shù)+adj./adv.比較級(jí)+thanBeg:LineAistwicelongerthanlineB.C、Ais+倍數(shù)+the+相應(yīng)n.(height/width/length/size)+of+Beg:LineAisthreetimesthelengthoflineB.D、Ais+倍數(shù)+that/those+ofBeg:Tom’sageistwicethatofJim’s.編號(hào)順序的表達(dá)eg:第一課Lessonone著重編號(hào)theFirstLesson著重順序數(shù)詞定義:表示數(shù)目多少或順序次第的詞叫作數(shù)詞。數(shù)詞包括基數(shù)詞和序數(shù)詞兩種基數(shù)詞1至12的基數(shù)詞是獨(dú)立的詞：onetwothreefourfivesixseveneightnineteneleventwelve13至19的基數(shù)詞以后綴-teen結(jié)尾：thirteenfourteenfifteensixteenseventeeneighteennineteen20至90的整十位數(shù)的詞以后綴-ty結(jié)尾：twentythirtyfortyfiftysixtyseventyeightyninety幾十幾的基數(shù)詞由十位數(shù)的詞和個(gè)位數(shù)的詞合成，中間加連字符“-”eg:34thirty-four42forty-two三位數(shù)的基數(shù)詞須在百位和十位（若無(wú)十位則和個(gè)位）之間加andeg:158onehundredandfifty-eight四位數(shù)即1，000以上的基數(shù)詞，從后往前數(shù)，每三位加一個(gè)逗號(hào)“，”第一個(gè)逗號(hào)前為千thousand,第二個(gè)逗號(hào)前為百萬(wàn)million,第三個(gè)逗號(hào)前為十億billioneg:6,364,285,751sixbillion,threehundredandsixty-fourmillion,twohundredandeighty-fivethousand,sevenhundredandfiftyone序數(shù)詞第1到第3:firstsecondthird第4到第19的序數(shù)詞以后綴-th結(jié)尾：fourthfifthsixthseventheighthninthtentheleventhtwelfththirteenthfourteenthfifteenthsixteenthseventeentheighteenthnineteenth第20到第90的十位數(shù)序數(shù)詞變-y為-i再加eth:twentieththirtiethfortiethfiftiethsixtiethseventietheightiethninetieth整單位數(shù)的序數(shù)詞直接加th:hundredththousandthmillionthbillionth其余的序數(shù)詞的構(gòu)成為：基數(shù)詞+序數(shù)詞eg:132ndonehundredandthirty-second小數(shù)表達(dá)法eg:3.26threepointtwosix分?jǐn)?shù)表達(dá)法eg:1/5onefifth2/5twofifths1/5oneinfive或oneoutoffive百分?jǐn)?shù)表達(dá)法eg:45%forty-fivepercent倍數(shù)表達(dá)法A、Ais+倍數(shù)as+adj./adv.原級(jí)(many/much+n.)+as+Beg:LineAisthreetimesaslongaslineB.(AustraliahasfourteentimesasmanypeopleasAmerica.)B、Ais+倍數(shù)+adj./adv.比較級(jí)+thanBeg:LineAistwicelongerthanlineB.C、Ais+倍數(shù)+the+相應(yīng)n.(height/width/length/size)+of+Beg